api: Add go files

I know this is a huge commit, but I can't be bothered to check
this in part by part.

api/domain.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"time"
+)
+
+type domain struct {
+	Domain                string      `json:"domain"`
+	OwnerHex              string      `json:"ownerHex"`
+	Name                  string      `json:"name"`
+	CreationDate          time.Time   `json:"creationDate"`
+	State                 string      `json:"state"`
+	ImportedComments      bool        `json:"importedComments"`
+	AutoSpamFilter        bool        `json:"autoSpamFilter"`
+	RequireModeration     bool        `json:"requireModeration"`
+	RequireIdentification bool        `json:"requireIdentification"`
+	Moderators            []moderator `json:"moderators"`
+}